US1793662A - Headlight - Google Patents

Description

Feb. 24, 1931. H, WOOD' 1,793,662

HEADLIGHT Filed June '7 92 William 15'. Wood Z v Inventor j W M A. z toz-neys 6 filament bulb, two beam patterns similar in necessary that the intensity Patented Feb. 24, 1931 WILLIAM H. WOOD, OF

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scorn EUCLID, OHIO HEADLIGHT Applicationnled June 7, 1926. Serial No. 114,167.

This invention relates to vehicle headlights and has for its object to provide in a cheap, simple, and convenient manner, a reflector which shall produce,'when used With atwo all respects save in elevation and without? need for any difi'using, diverging, or correcting lenses. It isat leastdesirable if not of the light vary at different parts ofthebeam, the region of greatest intensity being symmetrical about the vertical axis and approximately at the top of each beam. By double filament lamp I mean a lamp bulb having two light sources so arranged as to be usable selectively to produce an elevation or depression of the beam.

It has heretofore been suggested to modify a paraboloid reflector by a transversefiattening of numerous narrow vertical Zones thereof, but owin' to certain peculiarities of optics such a rel? ctor, while it works very satisfactorily with a single filament bulb, is wholly unsatisfactory when used with a bulb having two independently usable filaments'located one above the other. The result in such case is primarily a wide anddisordered diffusion with no substantial control of the beam.

According to my invention the two lateral portions of the reflector are made substantially paraboloid with their axis horizontal or nearly so and the lamp bulb located-with its two filaments one above the other and substantially in the same vertical line with the focal point thereof. The remainder of the reflector is striated vertically as heretofore described except that in addition to the striations the surfaces, both above and below the axis, are leaned downwardly below the surface of revolution defined by said lateral portions.

In the accompanying drawings I have shown the essential elements-of my invention Fig. 1 is a vertical sectional view through a headlight containing my improvements; Fig. 2 is a front elevation of the parts shown in Fig. 1; Figs. 3, 4 and 5 are front elevations of modifications; and Figs. 6 and 7 are horizontal sections on'the line 66 and 77, respectively. of Figs. 1 and 2.

small as shown in The reflector consistsof a single piece of sheet metal drawn in dies to the desired form. The side portions 1, 1 are paraboloid segments about the axis a.a with focal point aii .The top portion 2 and bottom portion 3 are leaned downwardly as indicated by the fact that they fall below the dotted lines A A of Fig. 1 which dotted line is an extension of such lateral portions 2 and 3 maybe of any ture in a vertical plane but are divided into plural vertical zones each having a modified lateral curvature which I here call striations. It will'be seen that all the striated or zoned portions are downwardly leaned as compared with the. paraboloid portions. Generally each vertical section through the portions 2, 3, approximates moreor less closely to one or more parabolas, generally having their axis or axes inclined as indicated at b b, and is here shown as having a focal region f 10-" cated at a lower level than the focal oint, 7.

With either filament the effect 0 the portions 1, 1 is to produce a concentrated beam, the t w o differing only ince levation; the inclination of the ortions 2, 3 relative there,- to causes the difl dsed rays to fall chiefly be low the level '0 stance. g

The dimensions of the portions 1, 1 as compared with the portions 2, 3, are subject to wide variation;-they may be comparatively Fig. 3 or the portions 2, 3, may be small as shown in Fig. 4. I prefer to employ the relation substantially shown in Fig. 2. The axis or axes of the portions 2 and 3 fall within the same vertical plane which contains the axis ofthe portions 11 and the heel portion of the reflector, namely the portions falling to the rear in general of the focal plane, may consist primarily of an extension of the portions 11 as shown in Fig. 4, or of the portions 2 and 3 as shown in Figs. 2, 3, and 5. In Fig. 5 I have shown the lateral portions as formed with very shallow circumferential striations 1*1 in order to produce an increased degree of diffusion within the concentrated beam.

The striations of the upper and lower regions coupled with the downward leaning paraboloidsegmentas. The

eslre curvathe intense beam in each inthereof as compared with the side wings produces a reflector having a very wide focusing tolerance. This device can bemade very simply b first producing a punch turned in its different quadrants to the axes aa,

b?), after which the indicated-portions are ound or milled, either to a greater or less egree of curvature, this milling being .con-

fined only to-those parts which were turned to the axis b-b.

Having thus described my invention what Iclaim is:

1. Aheadlight reflector having a pair of opposed lateral portions located at and upon both sides of the horizontal axial plane and forward of the focal plane consisting of paraboloid segments to a common horizontal axis,incombination with upper and lower portions located at and upon both sides of the vertical axial plane and forwardofthe focal plane leaned downwardly as compared with the paraboloid surface defined by said lateral segments, said upper and lower portions having narrow upright zones thereof flatted transversely.

2. A headlight reflector having a pair of opposed lateral portions located at and upon both sides of the horizontal axial plane and forward of the focal plane defined by'the o ation of a parabola about a single horizont a l 'axis, in combination with upper and lower portions located at and near the vertical axial lane and forwardly of the focal plane deed by a surface of revolution whose vertical axial section is parabolic with its axis downwardly inclined as compared with said first named axis, certain of said portions being extended to the rear of the focal plane and defining the heel part of the reflector, and at least a part of said reflector having striated portions of modified transverse curvature to spread the light laterally.

,3. A headlight reflector having portions consisting of narrow upright zones of're duced lateral curvature and paraboloid segments, said segmentsbeing located at oppo site sides of said reflector and in front of the focal plane and having a single horizontal axis, said zoned portions including the rest of the reflector and defined by a parabolic surface the axis of which is inclined downwardly as compared with said first axi 4. The combination with a lamp bulb having two independently usable concentrated filaments located one above the other, of a reflector having concentrating portions and diffusing portions, said concentrating portions defined by paraboloid segments located one at each side of said lamp with their common axis substantially horizontal, and said diffusing portions having upright zones of reduced transverse curvature, located above and below the lamp bulb, the vertical axial section of said reflector having a focal point on the same vertical line .with both filaments and the axis of such vertical axial section lying in the same plane with the common axis of said paraboloid segments and inclined obliquely thereto.

5. The combination witha lamp bulb having two independently usable concentrated filaments located one above the other, of a I 6. A reflector'having at opposite sides a pair of opposed paraboloid segments defined substantially by'surfaces of revolution about a horizontal axis and the remainder of the reflector consisting of portions whose vertical sections consist essentially or parabolas whose axes lie in the same vertical plane with said first axis and are inclined forwardly anddownwardly relative thereto and whose focal points are located on the same vertical line with the focal point of said first segments and whose horizontal section exhibits a series of flattened zones.

7 A reflector having two opposed lateral portions located at and upon both sides of the horizontal axial plane and in front of the focal plane defined by the rotation of a parabola about a single horizontal axis, in combination with upper and lower portions located at and upon both sides of the vertical' axial. section and'in front of the focal plane defined by a surface of revolution whose vertical axial section is parabolic with its axis downwardly inclined relative to said first axis, the focal points of said parabolas being located in the same vertical plane, certain of said portions being extended to the rear of the focal lane and constituting the heel part of the reflcctor, portions above mentioned having striated regions of modified transverse curvature to spread the light laterally. I i

In testimony whereof I hereunto aflix my signature.-

I WILLIAM Wotan.

e horizontal axial section, and ly-- ing in the same vertical plane therewith.

and at least upper and lowerv

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